Imagick::getImageBlob

(PECL imagick 2, PECL imagick 3)

Imagick::getImageBlob — Devuelve la secuencia de imágenes como un blob

Descripción

public Imagick::getImageBlob(): string

Implementa un formato directo en memoria. Devuelve la secuencia de imágenes en forma de string. El formato de la imagen determina el formato del BLOB devuelto (GIF, JPEG, PNG, etc.). Para devolver un formato diferente, utilice la función Imagick::setImageFormat().

Parámetros

Esta función no contiene ningún parámetro.

Valores devueltos

Devuelve un string que contiene las imágenes.

Errores/Excepciones

Lanza una excepción ImagickException si ocurre un error.

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User Contributed Notes 4 notes

down

Vee W ¶

9 years ago

For who want to show "animated" gif. This getImageBlob() will showing only one frame of image.
Use getImagesBlob() instead.

Example:

<?php
$Imagick = new \Imagick($real_source_image_path_animated_gif);
header("Content-Type: image/gif");
echo $Imagick->getImagesBlob();
?>

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anonymous at internet dot domain ¶

1 year ago

Function returns NULL without any error if ImageMagick policy.xml blocks handling the file format, i.e. PDF.
For PDF output edit /etc/ImageMagick-6/policy.xml and remove the line which disables rights for PDF.
If you use other functions, e.g. readImage() for PDF, ImageMagick nags about it and outputs the error message but this function fails silently.

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Trevor ¶

13 years ago

It seems that this method can return a zero-length string if faced with large-ish data.  No exceptions are thrown.

<?php
  $image = new Imagick();
  if (!$image->newImage(1000,1,'white')) throw new Exception();
  if (!$image->scaleImage(0,200)) throw new Exception();
  print "Image size: {$image->getImageWidth()},{$image->getImageHeight()}\n";
  if (!$image->setImageFormat("jpeg")) throw new Exception();
  $a = $image->getImageBlob();
  print "Rendered to ".strlen($a)." bytes\n";
?>

Restrict your output image size, or ensure that the blob you get back isn't empty.  (Note that IM seems to be doing the work, it delays for some time.  But there's no indication of any error anywhere.)

down

-1

jim at jimohalloran dot com ¶

4 years ago

Further to Trevor's note above about getImageBlob potentially returning an empty string for large images.  

This seems image format dependent.  I have a large (12046x8363) image which is returned ok.  But if I call setImageFormat('pdf') and then call getImageBlob() again.  Example:

<?php
// Image Manipulation here.
$pngData = $imagick->getImageBlob();  // Returns a large PNG.
$imagick->setImageFormat('pdf');
$pdfData = $imagick->getImageBlob(); // Returns empty string immediately
?>

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